STC Smartscan NG2, Manual

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EUD-2018086-00 Rev.3, SmartScanNG² User's Guide for Wayside Enclosure Components, 14 May 2021
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2.1.2 Processor Modules
Running programs written by STC, the processor modules control the entire SmartScanNG²
system. There are two independently operating processor modules, the Analyzer Processor
and the Communications Processor. The Analyzer Processor (Processor-A) is responsible for
data retrieval from external sources, such as the shielded temperature probe, scanners,
transducers, and auxiliary devices. The Communications Processor (Processor-B) is used to
process and store the retrieved data. It then presents information to the user in the form of
reports.
Processor-A initially stores train data in static random-access memory (SRAM) on the
processor module. After train passage, Processor-B moves this data to a nonvolatile Flash
memory for long-term storage. This memory contains:

The Trains directory, which contains data on each new train that passes the site. The
Train Summary report and Train Detail report get their data from this directory.

The Exceptions directory, which contains data on each train that has one or more
Exception Alarms or System Alarms. The Exception Summary report and Exception
Detail report get their data from this directory.
Each directory is organized as a circular buffer. In this scheme, data is added to the directory
until the directory is full. Once full, the oldest data in the directory is overwritten as new data is
recorded. The buffer for the Trains directory holds data on about 140,000 axles, but no more
than 100 trains. The buffer for the Exceptions directory holds data on about 4,500 axles, but
no more than 50 trains.